Fluoridation was supposed to help low-income children with Medicaid in the US where the children are over-fluoridate:

"Children covered under Medicaid receive considerably less dental care and have more untreated tooth decay than those who are privately insured, witnesses testified during a recent hearing held by the House Oversight and Government Reform Domestic Policy Subcommittee, CQ HealthBeat reports. According to CQ HealthBeat, a Government Accountability Office report released last month found that an estimated 6.5 million children covered by Medicaid had untreated tooth decay in 2005."